WHO classification of a varicocele
| Grade | Description |
| 0 | Subclinical varicocele: detectable only by Doppler sonography (by ultrasonography) or thermography |
| I | Visible or palpable only under valsalva maneuver |
| II | Varicocele palpable under resting conditions but not visible |
| III | Varicocele already easily palpable and visible under resting conditions |